Restore Your Buick’s Performance and Drivability
Is your 2006-2011 Buick Lucerne suffering from jarring shifts, getting stuck in gear, or throwing transmission codes? You’re not just dealing with an annoyance; you’re facing a common failure point: the Transmission Control Module (TCM). As a technician with over 20 years of experience, I’ve seen firsthand how a faulty TCM can sideline an otherwise reliable vehicle. This T42 series TCM, part number 24235754, is the definitive solution, engineered to restore the smooth, predictable performance you expect from your car.
This isn’t just a replacement part; it’s a complete, ready-to-install fix. We pre-program the module to your vehicle’s specific VIN, eliminating the need for expensive dealership visits and complex programming tools. It arrives at your door ready to be installed, making it the perfect choice for both professional mechanics and savvy DIYers looking to save time and money.
Case Study: A Tricky Diagnosis
A customer brought in a 2008 Buick Lucerne with a frustrating intermittent issue: it would occasionally refuse to shift out of 2nd gear, but only after driving for 20+ minutes. No check engine light was on, but a deep scan revealed a stored history code P0750 (Shift Solenoid ‘A’ Malfunction). Another shop had already replaced the solenoid with no success. After reviewing the data, I suspected the TCM was failing under heat. We installed one of our VIN-programmed T42 modules, and the problem was solved instantly. The issue wasn’t the solenoid itself, but the computer controlling it—a classic TCM failure scenario I’ve diagnosed hundreds of times.
Is Your Buick Exhibiting These Transmission Faults?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, this module is likely the solution you need. Don’t let a small electronic component lead to a major transmission problem.
- ✔ Harsh, delayed, or erratic gear changes that make driving uncomfortable.
- ✔ Vehicle enters “limp mode,” often getting stuck in a single gear (usually 2nd or 3rd).
- ✔ Check Engine Light or Transmission Warning Light is illuminated on the dash.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, or other solenoid-related faults.
- ✔ A noticeable drop in fuel economy due to inefficient shifting.
- ✔ Complete failure to shift gears, either up or down.
Why Our 2006-2011 Lucerne TCM is the Superior Choice
This module directly communicates with your vehicle’s engine computer and transmission sensors to manage shift points, torque converter clutch engagement, and line pressure. Our pre-programming service ensures that all the latest factory software updates from GM are loaded onto your module. This not only guarantees compatibility but often improves upon the original performance, addressing known factory bugs and enhancing transmission longevity. Built to strict OEM specifications and backed by a one-year warranty, it provides lasting reliability.
DIY-Friendly Installation in Under 30 Minutes
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning work. This prevents electrical shorts and helps reset the vehicle’s computer systems.
- ✔ Locate the Module: On the 2006-2011 Buick Lucerne, the TCM is typically found in the engine compartment, often on the driver’s side (LH) near the strut tower or under the air cleaner housing.
- ✔ Disconnect and Remove: Carefully unplug the electrical connectors. Note the tab locations to avoid damage. Then, unbolt the module from its mounting bracket.
- ✔ Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses. You should hear a click as they lock in.
- ✔ Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s best practice to use a standard OBD2 scan tool to clear any stored transmission codes to ensure a clean slate for the new part.
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for part number 24235754 and is interchangeable with many other GM service numbers. While it fits a wide range of vehicles, it has been confirmed for the following models and configurations:
- Buick Lucerne: 2006-2007 (4.6L), 2008-2011 (All Engines) – Located in LH engine compartment.
- Buick Allure / LaCrosse: 2006-2009 – Located under lower air cleaner housing.
- Cadillac DTS: 2006-2011 – Located in RH front engine compartment.
- Chevrolet Impala / Monte Carlo: 2006-2011 – Located under lower air cleaner housing.
- Chevrolet Silverado / GMC Sierra 1500: 2007-2013 – Located next to the battery.
- …and many other GM cars, trucks, and SUVs from 2006-2014. Please verify your part number or contact us with your VIN.
Frequently Asked Questions
What does a Transmission Control Module (TCM) do?
The TCM is the electronic brain of your automatic transmission. It receives data from various sensors and uses it to control shift solenoids, line pressure, and torque converter lockup, ensuring smooth and efficient gear changes.
Is this part really plug-and-play? Do I need a mechanic?
Yes! Because we program the module to your car’s VIN before shipping, it is ready for immediate installation without any special tools or dealer visits. It’s a straightforward process that many of our DIY customers complete in their own driveway.
Where is the TCM located on my 2009 Lucerne?
For the 2006-2011 Buick Lucerne, the TCM is consistently located in the engine compartment on the driver’s side (left-hand side). Check near the strut tower or beneath the air filter box assembly.
My original part has a different number on it. Will this still work?
Yes, it’s very common for GM to use multiple service numbers for the same part. This module, 24235754, is a direct replacement for dozens of other part numbers. As long as your vehicle is on the compatibility list, this module will function correctly.
What kind of warranty is included?
We stand behind our products. This transmission control module comes with a comprehensive one-year warranty, giving you confidence and peace of mind in your repair.